Long-distance atom-photon entanglement

Abstract

We report the observation of entanglement between a single trapped atom and a single photon at remote locations. The degree of coherence of the entangled atom-photon pair is verified via appropriate local correlation measurements, after communicating the photon via an optical fiber link of 300 m length. In addition we measured the temporal evolution of the atomic density matrix after projecting the atom via a state measurement of the photon onto several well defined spin states. We find that the state of the single atom dephases on a timescale of 150 $\mu$s, which represents an important step toward long-distance quantum networking with individual neutral atoms.

4 pages, 4 figures

References in corpus (16)

• Experimental quantum teleportation
• Quantum teleportation between light and matter
• Experimental demonstration of quantum memory for light
• Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories
• Measurement-Induced Entanglement for Excitation Stored in Remote Atomic Ensembles
• Bell inequality violation with two remote atomic qubits
• Robust long-distance entanglement and a loophole-free Bell test with ions and photons
• Reversible state transfer between light and a single trapped atom
• Multiplexed Memory-Insensitive Quantum Repeaters
• Entanglement of remote atomic qubits
• Memory-built-in quantum teleportation with photonic and atomic qubits
• Entanglement of a photon and a collective atomic excitation
• Remote preparation of an atomic quantum memory
• Coherence properties and quantum state transportation in an optical conveyor belt
• Fast Quantum State Control of a Single Trapped Neutral Atom
• Direct measurement of decoherence for entanglement between a photon and stored atomic excitation

Cited by in corpus (27)

• Quantum Memories. A Review based on the European Integrated Project "Qubit Applications (QAP)"
• Event-Ready Bell Test Using Entangled Atoms Simultaneously Closing Detection and Locality Loopholes
• Coherence and Raman sideband cooling of a single atom in an optical tweezer
• Entangling single atoms over 33 km telecom fibre
• A Quantum-Logic Gate between Distant Quantum-Network Modules
• Towards real-world quantum networks: a review
• Essential entanglement for atomic and molecular physics
• Wide-band quantum interface for visible-to-telecommunication wavelength conversion
• Photon-Photon Entanglement with a Single Trapped Atom
• Entanglement of light-shift compensated atomic spin waves with telecom light
• Lossless State Detection of Single Neutral Atoms
• Development of a Boston-area 50-km fiber quantum network testbed
• High-fidelity conversion of photonic quantum information to telecommunication wavelength with superconducting single-photon detectors
• A nondestructive Bell-state measurement on two distant atomic qubits
• Quantum Interference of Stored Coherent Spin-wave Excitations in a Two-channel Memory
• Loophole-free Bell test for one atom and less than one photon
• Image Transfer through Two Sequential Four-Wave Mixing in a Hot Atomic Vapor
• Detecting an Itinerant Optical Photon Twice without Destroying It
• Polarization gradient cooling of single atoms in optical dipole traps
• Non-classical two-photon interference between independent telecom light pulses converted by difference-frequency generation
• Coherence of a qubit stored in Zeeman levels of a single optically trapped atom
• Ion-Photon Entanglement and Bell Inequality Violation with 138Ba+
• Heralded Mapping of Photonic Entanglement into Single Atoms in Free Space: Proposal for a Loophole-Free Bell Test
• Dynamical Decoupling in Optical Fibers: Preserving Polarization Qubits from Birefringent Dephasing
• A source of heralded atom-photon entanglement for quantum networking
• Bell inequalities under non-ideal conditions
• Two-photon interferometry illuminates quantum measurements